6 COOLANT
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
115
Pub. No. 291Y1-40720 Revision: 5
3 Spread a drop of water over the
surface of the prism taking care that
air bubbles will not enter it.
Fig. 6-5 Tool - Adjust 3
4 Read the scale through the
eyepiece.
• Rotate the eyepiece to either side to focus.
Fig. 6-6 Tool - Adjust 4
5 Confirm the boundary line of blue
color aligns with the 0% on the
scale.
• If it does not align, rotate the scale adjusting
screw by using a scale adjusting tool and let
it align.
Fig. 6-7 Tool - Adjust 5
6 Wipe the surface of the prism and
daylight plate with water-soaked
soft facial tissue.
Fig. 6-8 Tool - Adjust 6
Measurement
• Before measuring the LLC
concentration, be sure to adjust
tools "
Tool - Adjust" (→ Page 114).
1 Place a sample of one or two drops
of coolant/water mixture on the
prism.
Fig. 6-9 LLC Concentration Measurement 1
2 Close the daylight plate slowly.
Fig. 6-10 LLC Concentration Measurement 2
60
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
50
40
30
20
10
00
-50
-40
-30
-20
-10
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